diff --git a/modem/arq_session.py b/modem/arq_session.py
index 17481acc..bbb13403 100644
--- a/modem/arq_session.py
+++ b/modem/arq_session.py
@@ -25,3 +25,12 @@ class ARQSession():
     def get_mode_by_speed_level(self, speed_level):
         return self.MODE_BY_SPEED[speed_level]
 
+    def transmit_frame(self, frame: bytearray):
+        modem_queue_item = {
+            'mode': self.get_mode_by_speed_level(self.speed_level),
+            'repeat': 1,
+            'repeat_delay': 1,
+            'frame': frame,
+        }
+        self.tx_frame_queue.put(modem_queue_item)
+
diff --git a/modem/arq_session_irs.py b/modem/arq_session_irs.py
index 81a2ae75..51ea7047 100644
--- a/modem/arq_session_irs.py
+++ b/modem/arq_session_irs.py
@@ -1,8 +1,9 @@
 import threading
 import data_frame_factory
 import queue
+import arq_session
 
-class ARQSessionIRS():
+class ARQSessionIRS(arq_session.ARQSession):
 
     STATE_CONN_REQ_RECEIVED = 0
     STATE_WAITING_DATA = 1
@@ -15,9 +16,8 @@ class ARQSessionIRS():
     TIMEOUT_DATA = 2
 
     def __init__(self, config: dict, tx_frame_queue: queue.Queue, dxcall: str, session_id: int):
-        self.config = config
-        self.tx_frame_queue = tx_frame_queue
-        self.dxcall = dxcall
+        super().__init__(config, tx_frame_queue, dxcall)
+
         self.id = session_id
 
         self.received_data = b''
@@ -38,9 +38,6 @@ class ARQSessionIRS():
         self.log(f"ARQ Session {self.id} state {self.state}")
         self.state = state
 
-    def transmit_frame(self, frame: bytearray):
-        self.tx_frame_queue.put(frame)
-
     def set_modem_decode_modes(self, modes):
         pass
 
diff --git a/modem/arq_session_iss.py b/modem/arq_session_iss.py
index 979e2602..cc445beb 100644
--- a/modem/arq_session_iss.py
+++ b/modem/arq_session_iss.py
@@ -41,15 +41,6 @@ class ARQSessionISS(arq_session.ARQSession):
         self.log(f"ARQ Session {self.id} state {self.state}")
         self.state = state
 
-    def transmit_frame(self, frame: bytearray):
-        modem_queue_item = {
-            'mode': self.get_mode_by_speed_level(self.speed_level),
-            'repeat': 1,
-            'repeat_delay': 1,
-            'frame': frame,
-        }
-        self.tx_frame_queue.put(modem_queue_item)
-
     def runner(self):
         if not self.connect():
             return False
diff --git a/tests/test_arq_session.py b/tests/test_arq_session.py
index c0f73159..d8ea3cc8 100644
--- a/tests/test_arq_session.py
+++ b/tests/test_arq_session.py
@@ -49,7 +49,7 @@ class TestARQSession(unittest.TestCase):
         self.iss_to_irs_channel = threading.Thread(target=self.channelWorker, 
                                               args=[self.iss_modem_transmit_queue, 
                                                     self.irs_frame_dispatcher],
-                                                    name = "IRS to ISS channel")
+                                                    name = "ISS to IRS channel")
         self.iss_to_irs_channel.start()
 
         self.irs_to_iss_channel = threading.Thread(target=self.channelWorker, 
diff --git a/tests/test_data_frame_factory.py b/tests/test_data_frame_factory.py
index 8b938fbf..b944031a 100755
--- a/tests/test_data_frame_factory.py
+++ b/tests/test_data_frame_factory.py
@@ -35,8 +35,7 @@ class TestDataFrameFactory(unittest.TestCase):
 
         self.assertEqual(frame_data['origin'], self.factory.myfullcall)
 
-        frame_session_id = int.from_bytes(frame_data['session_id'], 'big')
-        self.assertEqual(frame_session_id , session_id)
+        self.assertEqual(frame_data['session_id'] , session_id)
 
     def testCQ(self):
         frame = self.factory.build_cq()